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1/* crypto/dh/dh.h */
2/* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
3 * All rights reserved.
4 *
5 * This package is an SSL implementation written
6 * by Eric Young (eay@cryptsoft.com).
7 * The implementation was written so as to conform with Netscapes SSL.
8 *
9 * This library is free for commercial and non-commercial use as long as
10 * the following conditions are aheared to. The following conditions
11 * apply to all code found in this distribution, be it the RC4, RSA,
12 * lhash, DES, etc., code; not just the SSL code. The SSL documentation
13 * included with this distribution is covered by the same copyright terms
14 * except that the holder is Tim Hudson (tjh@cryptsoft.com).
15 *
16 * Copyright remains Eric Young's, and as such any Copyright notices in
17 * the code are not to be removed.
18 * If this package is used in a product, Eric Young should be given attribution
19 * as the author of the parts of the library used.
20 * This can be in the form of a textual message at program startup or
21 * in documentation (online or textual) provided with the package.
22 *
23 * Redistribution and use in source and binary forms, with or without
24 * modification, are permitted provided that the following conditions
25 * are met:
26 * 1. Redistributions of source code must retain the copyright
27 * notice, this list of conditions and the following disclaimer.
28 * 2. Redistributions in binary form must reproduce the above copyright
29 * notice, this list of conditions and the following disclaimer in the
30 * documentation and/or other materials provided with the distribution.
31 * 3. All advertising materials mentioning features or use of this software
32 * must display the following acknowledgement:
33 * "This product includes cryptographic software written by
34 * Eric Young (eay@cryptsoft.com)"
35 * The word 'cryptographic' can be left out if the rouines from the library
36 * being used are not cryptographic related :-).
37 * 4. If you include any Windows specific code (or a derivative thereof) from
38 * the apps directory (application code) you must include an acknowledgement:
39 * "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
40 *
41 * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
42 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
43 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
44 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
45 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
46 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
47 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
48 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
49 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
50 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
51 * SUCH DAMAGE.
52 *
53 * The licence and distribution terms for any publically available version or
54 * derivative of this code cannot be changed. i.e. this code cannot simply be
55 * copied and put under another distribution licence
56 * [including the GNU Public Licence.]
57 */
58
59#ifndef HEADER_DH_H
60#define HEADER_DH_H
61
62#ifdef NO_DH
63#error DH is disabled.
64#endif
65
66#ifndef NO_BIO
67#include <openssl/bio.h>
68#endif
69#include <openssl/bn.h>
70#include <openssl/crypto.h>
71
72#define DH_FLAG_CACHE_MONT_P 0x01
73
74#ifdef __cplusplus
75extern "C" {
76#endif
77
78typedef struct dh_st DH;
79
80typedef struct dh_method {
81 const char *name;
82 /* Methods here */
83 int (*generate_key)(DH *dh);
84 int (*compute_key)(unsigned char *key,BIGNUM *pub_key,DH *dh);
85 int (*bn_mod_exp)(DH *dh, BIGNUM *r, BIGNUM *a, const BIGNUM *p,
86 const BIGNUM *m, BN_CTX *ctx,
87 BN_MONT_CTX *m_ctx); /* Can be null */
88
89 int (*init)(DH *dh);
90 int (*finish)(DH *dh);
91 int flags;
92 char *app_data;
93} DH_METHOD;
94
95struct dh_st
96 {
97 /* This first argument is used to pick up errors when
98 * a DH is passed instead of a EVP_PKEY */
99 int pad;
100 int version;
101 BIGNUM *p;
102 BIGNUM *g;
103 int length; /* optional */
104 BIGNUM *pub_key; /* g^x */
105 BIGNUM *priv_key; /* x */
106
107 int flags;
108 char *method_mont_p;
109 /* Place holders if we want to do X9.42 DH */
110 BIGNUM *q;
111 BIGNUM *j;
112 unsigned char *seed;
113 int seedlen;
114 BIGNUM *counter;
115
116 int references;
117 CRYPTO_EX_DATA ex_data;
118#if 0
119 DH_METHOD *meth;
120#else
121 struct engine_st *engine;
122#endif
123 };
124
125#define DH_GENERATOR_2 2
126/* #define DH_GENERATOR_3 3 */
127#define DH_GENERATOR_5 5
128
129/* DH_check error codes */
130#define DH_CHECK_P_NOT_PRIME 0x01
131#define DH_CHECK_P_NOT_SAFE_PRIME 0x02
132#define DH_UNABLE_TO_CHECK_GENERATOR 0x04
133#define DH_NOT_SUITABLE_GENERATOR 0x08
134
135/* primes p where (p-1)/2 is prime too are called "safe"; we define
136 this for backward compatibility: */
137#define DH_CHECK_P_NOT_STRONG_PRIME DH_CHECK_P_NOT_SAFE_PRIME
138
139#define DHparams_dup(x) (DH *)ASN1_dup((int (*)())i2d_DHparams, \
140 (char *(*)())d2i_DHparams,(char *)(x))
141#define d2i_DHparams_fp(fp,x) (DH *)ASN1_d2i_fp((char *(*)())DH_new, \
142 (char *(*)())d2i_DHparams,(fp),(unsigned char **)(x))
143#define i2d_DHparams_fp(fp,x) ASN1_i2d_fp(i2d_DHparams,(fp), \
144 (unsigned char *)(x))
145#define d2i_DHparams_bio(bp,x) (DH *)ASN1_d2i_bio((char *(*)())DH_new, \
146 (char *(*)())d2i_DHparams,(bp),(unsigned char **)(x))
147#ifdef __cplusplus
148#define i2d_DHparams_bio(bp,x) ASN1_i2d_bio((int (*)())i2d_DHparams,(bp), \
149 (unsigned char *)(x))
150#else
151#define i2d_DHparams_bio(bp,x) ASN1_i2d_bio(i2d_DHparams,(bp), \
152 (unsigned char *)(x))
153#endif
154
155DH_METHOD *DH_OpenSSL(void);
156
157void DH_set_default_openssl_method(DH_METHOD *meth);
158DH_METHOD *DH_get_default_openssl_method(void);
159#if 0
160DH_METHOD *DH_set_method(DH *dh, DH_METHOD *meth);
161DH *DH_new_method(DH_METHOD *meth);
162#else
163int DH_set_method(DH *dh, struct engine_st *engine);
164DH *DH_new_method(struct engine_st *engine);
165#endif
166
167DH * DH_new(void);
168void DH_free(DH *dh);
169int DH_size(DH *dh);
170int DH_get_ex_new_index(long argl, void *argp, CRYPTO_EX_new *new_func,
171 CRYPTO_EX_dup *dup_func, CRYPTO_EX_free *free_func);
172int DH_set_ex_data(DH *d, int idx, void *arg);
173void *DH_get_ex_data(DH *d, int idx);
174DH * DH_generate_parameters(int prime_len,int generator,
175 void (*callback)(int,int,void *),void *cb_arg);
176int DH_check(DH *dh,int *codes);
177int DH_generate_key(DH *dh);
178int DH_compute_key(unsigned char *key,BIGNUM *pub_key,DH *dh);
179DH * d2i_DHparams(DH **a,unsigned char **pp, long length);
180int i2d_DHparams(DH *a,unsigned char **pp);
181#ifndef NO_FP_API
182int DHparams_print_fp(FILE *fp, DH *x);
183#endif
184#ifndef NO_BIO
185int DHparams_print(BIO *bp, DH *x);
186#else
187int DHparams_print(char *bp, DH *x);
188#endif
189void ERR_load_DH_strings(void );
190
191/* BEGIN ERROR CODES */
192/* The following lines are auto generated by the script mkerr.pl. Any changes
193 * made after this point may be overwritten when the script is next run.
194 */
195
196/* Error codes for the DH functions. */
197
198/* Function codes. */
199#define DH_F_DHPARAMS_PRINT 100
200#define DH_F_DHPARAMS_PRINT_FP 101
201#define DH_F_DH_COMPUTE_KEY 102
202#define DH_F_DH_GENERATE_KEY 103
203#define DH_F_DH_GENERATE_PARAMETERS 104
204#define DH_F_DH_NEW 105
205
206/* Reason codes. */
207#define DH_R_NO_PRIVATE_VALUE 100
208
209#ifdef __cplusplus
210}
211#endif
212#endif
213
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